The release of treated wastewater from the Fukushima Daiichi Nuclear Power Plant in Japan has sparked concerns and controversy over the potential risks associated with nuclear-affected destinations. This study uses grounded theory to elucidate the broader definition of nuclear and radiation crises, while comprehensively analysing potential tourists’ decision-making processes in the face of such risks. Focus groups and interviews were conducted in Asia with participants from various countries, revealing how potential tourists receive, process, and perceive risk information cues, make decisions, and adopt behavioural responses. This research contributes to the existing literature in an interdisciplinary manner, providing insights and recommendations for stakeholders involved in tourism and risk management.